Relevant bibliographies by topics / Lichens

Academic literature on the topic 'Lichens'

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Published: 4 June 2021
Last updated: 29 July 2024

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Journal articles on the topic "Lichens"

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Farkas, E. "Notes and Schedae to Lichenes Delicati Exsiccati Editae in Memoriam Antonín Vězda (1920–2008), Fasc. 6." Acta Botanica Hungarica 63, no. 1-2 (April 19, 2021): 51–66. http://dx.doi.org/10.1556/034.63.2021.1-2.4.

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Lichenes Delicati Exsiccati Editae of little, fine, special lichens is edited in honour of Antonín Vězda (1920–2008). The sixth fascicle of the exsiccate is consisted of 20 species of lichens and lichenicolous fungi and distributed to 12 lichen herbaria of the world. Collectors are J. Halda, G. Kantvilas, L. Lőkös, Z. Palice, N. Varga and E. Farkas.
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Farkas, E. "Notes and schedae to lichenes delicati exsiccati editae in memoriam Antonín Vězda (1920–2008), Fasc. 5." Acta Botanica Hungarica 62, no. 1-2 (March 2020): 23–32. http://dx.doi.org/10.1556/034.62.2020.1-2.3.

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Lichenes Delicati Exsiccati Editae of little, fine, special lichens is edited in honour of Antonín Vězda (1920–2008). The fifth fascicle of the exsiccate is consisted of 20 species of lichens and lichenicolous fungi and distributed to 12 lichen herbaria of the world. Collectors are K. Buaruang, D. Kalb, K. Kalb, G. E. Lee, L. Lőkös, A. Mertens, W. Polyiam, T. Pócs, W. Saipunkaew, D. Tang, N. Varga and E. Farkas.
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Sonina, Anzhella V. "Epilithic lichens and their morphological adaptations to the conditions of the White and Barents Seas coast (Russian Arctic)." Czech Polar Reports 2, no. 2 (June 1, 2012): 109–16. http://dx.doi.org/10.5817/cpr2012-2-11.

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The main aim of our work was to investigate the biodiversity of coastal lichens, conditions of lichen cover formation, and study the structural and functional adaptations of Lecanora intricata (Ach.) Ach. and L. polytropa (Ehrh. ex Hoffm.) Rabenh. The investigation was carried out during 2008-2012 on cliffs both along the Murmansk (the Barents Sea) coast and the southern and western shores of the White Sea. For the evaluation of species composition, and ecotopic coenotical features of epilithic lichen growing on cliffs, the geobotanical methods have been used. In addition, the anatomical, morphological and biochemical studies of Lecanora intricata and L. polytropa have been made. 91 species have been included in the total list of lichens on the White Sea coast. On the Murmask coast of the Barents Sea, 36 lichen species had revealed. On the coastal territory, the epilithic lichens inhabit the upper littoral and supralittoral zone. The lichen cover is formed by two interacting factors: the water factor (sea) and the terrestrial vegetation. Four lichen zones were distinguished in the all studying territories. They differed by the lichen species composition and effect of the sea. The first lichen’s zone is the intrazonal structure in the complex coastal lichen cover. In Lecanora polytropa and L. intricata, structural and functional features of lichens for adaptation to unstable coastal conditions were identified. The crustose biomorphs were better adapted to temperature and degree of hydration of thalli. Formation of the smallest ascospores is reproductive strategy of epilithic lichens in extreme habitats. High content of usnic acid in the studied lichen thalli allows them to exist in the open areas exposed to solar radiation and provides the biotic regulation that affects the structure of lichen cover. Optimal ratio of algal to fungal components in the thalli of these species is necessary to maintain their life in extreme environments.
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Gordon, Catriona A., Rafael Herrera, and Tom C. Hutchinson. "The use of a common epiphytic lichen as a bioindicator of atmospheric inputs to two Venezuelan cloud forests." Journal of Tropical Ecology 11, no. 1 (February 1995): 1–26. http://dx.doi.org/10.1017/s026646740000835x.

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ABSTRACTThe chemistry of epiphytic lichens was determined in two Venezuelan cloud forests adjacent to the Caracas Valley at Altos de Pipe and El Avila National Park. This is the second component of a two-part study examining the chemistry of fogs and their effects on sensitive biota in these forests. The widespread lichen Parmotrema madagascariaceum was chosen as an indicator of trace metal input. Background lichen collections and transplant experiments were carried out to evaluate spatial trends in atmospheric depositon of trace metals at different altitudes and exposures of the two montane locations. Elevated concentratons of metals including Pb and Zn were seen in lichen tissue and associated bark. Lead levels in lichens reached 190 μg g-1 dry wt. Lichens transplanted from relatively ‘clean’ to more polluted sites showed significant increases of metals, particularly Pb. Increases of up to 6.3 μg Pb g-1 mo-1 after 6 and 10 months were recorded relative to background and in situ lichen material. In contrast, when lichsens were reciprocally transplanted in nylon net bags from less to more exposed sites there was a significant decrease in Pb and Zn concentrations after 6 and 10 months. With long-term exposure to elevated concentrations of these trace metals epiphytic lichens, as well as other sensitive cloud forest biota, may be at risk of decline.
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KUSMORO, JOKO, IIN SUPARTINAH NOER, MUHAMAD FEISAL JATNIKA, RIRIN EKA PERMATASARI, and RUHYAT PARTASASMITA. "Lichen diversity in geothermal area of Kamojang, Bandung, West Java, Indonesia and its potential for medicines and dyes." Biodiversitas Journal of Biological Diversity 19, no. 6 (October 9, 2018): 2335–43. http://dx.doi.org/10.13057/biodiv/d190643.

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Kusmoro J, Noer IS, Jatnika MF, Permatasari RE, Partasasmita R. 2018. Lichen diversity in geothermal area of Kamojang, Bandung, West Java, Indonesia and its potential for medicines and dyes. Biodiversitas 19: 2335-2343. The study of lichens diversity in Kamojang, West Java was conducted by survey in geothermal field area following the line transect 6 km along to the East, North West and south from the Power House of Geothermal Power Plant. The lichen samples were taken from bark, soil, and stone. Lichen identification was done by morphological, anatomy and chemical analysis. Dyes potency of Parmotrema and Usnea test using ammoniac fermentation was done in Plant Taxonomy Laboratory of Department Biology, Faculty of Mathematics and Natural Sciences, University of Padjadjaran. The survey has successfully collected 133 species of lichens, belong to 62 genera and 17 families. Parmeliaceae was found as dominant groups, consisting of 33 species and other co-dominant groups are Graphidaceae and Lobariaceae with 24 species and 8 species, respectively. Most lichens in Kamojang geothermal area belong to Ascomycetes, only one Basidiomycetes such as Dictyonema sericeum (Sw.) which found at Kawah Manuk (Manuk crater) area. The rare species of lichens such as Usnea longissima Ach, was found at Pine forest in Arboretum 6 km south of Powerhouse of Kamojang geothermal. Chemical analysis and literature study for Lichenic acid contains was done and generally, atranorin, usnic acid, barbatic and lecanoric acid was found in lichens samples. Amoniac fermentation result showed that Parmotrema tinctorum produced brownish red, red and purple, which occurred within 1 week to 5 weeks after fermentation. While Usnea produced variety of brown color, which occurred within 5 days up to 4 weeks after fermentation. Lichen species containing some medical properties are Bulbothrix, Cladonia and Usnea. While lichens having dyes properties are Hypogymnia, Lobaria, Peltigera, Usnea, and Parmotrema.
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Noer, Iin Supartinah, Joko Kusmoro, Erwan Yudiar Darussalam, Dwi Nur Laksono, and Aan Abdul Hakim. "THE LICHENS DIVERSITY IN TRIANGULATION OF ALAS PURWO NATIONAL PARK, EAST JAVA." KnE Life Sciences 2, no. 1 (September 20, 2015): 265. http://dx.doi.org/10.18502/kls.v2i1.154.

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<p>The lichen flora of tropical areas is still much underworked Java in general and Alas Purwo in East Java for specially is no exception. Alas Purwo National Park is representative of a typical lowland tropical rain forest ecosystem in Java. . It is famous with peculiar and endemic species of plant include sawo kecik (Manilkara kauki) and manggong bamboo (Gigantochloa manggong). , beside among the other plants also ketapang (Terminalia cattapa), nyamplung (Calophyllum inophyllum), kepuh (Sterculia foetida), and keben (Barringtonia asiatica). Moreover, in lowland tropical rain forest ecosystem have reported the lichens species diversity is very high and may include over 200 species in 1 ha. There is no reported have found concerning the lichens richness in Alas Purwo. Recently preliminary study of Lichens diversity have been done at triangulation Zone Alas Purwo National Park , East Java. The lichens of the study area have not been treated comprehensively. We explored the lichenological characteristics of putative”tropical lowland cloud forest” (LCF) in a lowland area (0–20ma.s.l.) near Triangulation using macrolichens (cortocoulous species) as indicator taxa We analyzed lichen diversity on 20 trees in two 0,25 ha plots. In tropical lowland forests, corticolous green algal lichens are abundant and highly diverse. This may be related to adaptation to prevailing microenvironmental conditions including, for example, high precipitation and low light intensities. In the understory of a tropical lowland rain forest in Alas Purwo , we studied the morphology and anatomy of corticolous lichens and microcristal test. We found that from Tetrasigma sp , Serbella otodans, Hemandia feltata Baringtonia aciatika Pandanaceae Manilcara cauci Swetinia mahagoni trees there are 30 species of lichens, dominated by Dyorigma sp Graphis and Glyphis from familia of Graphidaceae and Dirinaria Physcia Pyxine Ramalina from familia of Parmeliaceae. The thallus calour was variety from Green-grey, Green-bllue, green, light green, grey, brown, dark green to orange. They have vegetative as wel as generative reproduction such as isidia, soralia, soredia, chypellae, histerothecia, perithecia,and apothecia. The lichenic acids contain such as gyrophoric acid, barbatic acid, usnic acid, atranorin, acid, divaricatic acid and lecanoric acid, </p><p><strong>Keywords</strong>: Alas Purwo, lichens and lichenic acid.</p>
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He, Zichen, and Takeshi Naganuma. "Chronicle of Research into Lichen-Associated Bacteria." Microorganisms 10, no. 11 (October 26, 2022): 2111. http://dx.doi.org/10.3390/microorganisms10112111.

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Lichens are mutually symbiotic systems consisting of fungal and algal symbionts. While diverse lichen-forming fungal species are known, limited species of algae form lichens. Plasticity in the combination of fungal and algal species with different eco-physiological properties may contribute to the worldwide distribution of lichens, even in extreme habitats. Lichens have been studied systematically for more than 200 years; however, plasticity in fungal–algal/cyanobacterial symbiotic combinations is still unclear. In addition, the association between non-cyanobacterial bacteria and lichens has attracted attention in recent years. The types, diversity, and functions of lichen-associated bacteria have been studied using both culture-based and culture-independent methods. This review summarizes the history of systematic research on lichens and lichen-associated bacteria and provides insights into the current status of research in this field.
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Fitriyyah, Putri Nurul, and Taufikurahman. "Heavy metals accumulation in lichens Parmeliaceae and mahogany bark as an indicator of air and pollution levels in several locations in Bandung City." Acta Biochimica Indonesiana 6, no. 2 (May 31, 2024): 169. http://dx.doi.org/10.32889/actabiona.169.

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Background: Lichens and tree bark are well-known biomonitoring tools for accumulating pollutants in their tissues over an extended period. Objective: This study aims to determine the concentration of heavy metals accumulated in lichens and tree bark across various locations in Bandung City, analyze the impact of heavy metal accumulation on lichen diversity, and assess the lichen cover area on tree bark. Methods: Lichen and bark samples were collected from mahogany trees using plotless sampling at a height of 100 cm, employing a quadrat size of 20x32 cm² above the ground. A total of 25 sampling stations were distributed across five locations in Bandung City, including city parks, an urban forest park, and a bus station. The samples were analyzed using Atomic Absorption Spectrophotometry (AAS) to measure the concentration of heavy metals. Results: The results revealed that lichens and bark from Persib City Park (PCP) contained the highest concentration of chromium (Cr), with 17.08 μg/kg in lichens and 30.03 μg/kg in the bark, as well as lead (Pb), with 24.38 μg/kg in lichens and 15.49 μg/kg in the bark. Conversely, lichens and bark from Djuanda Forest Park (DFP) exhibited the lowest concentration of chromium (3.74 μg/kg in lichens and 3.56 μg/kg in the bark) and lead (3.74 μg/kg in lichens and 2.06 μg/kg in the bark). PCA analysis indicated that the accumulation of heavy metals in lichens and bark was associated with environmental factors, such as traffic density and bark pH. Conclusion: The accumulation of heavy metals in lichens and bark exhibited a negative correlation with lichen diversity and the area of lichen cover on the bark.
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Gogoi, Rupjyoti, Dipanjali Devi, Sanjeeva Nayaka, and Farishta Yasmin. "A checklist of lichens of Assam, India." Asian Journal of Conservation Biology `11, no. 1 (May 16, 2022): 49–65. http://dx.doi.org/10.53562/ajcb.73760.

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, Lichens not only play a major role in plant succession as pioneer species but also provide many ecosystem services. Various anthropogenic activities like habitat destruction, air pollution and over exploitation of lichens for economic uses seem to be the main threats for loss of lichen diversity. Hence, for in situ conservation of lichens, it is a prioritised need to document lichen species of a locality. Lichens of Assam are being extensively studied from a taxonomic point of view in recent years. An accurate and updated checklist of lichens is not available so far. Here we expand the knowledge of the lichen of Assam by critically surveyed the literatures and prepared an updated list of total 657 species of Assam.
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Petrzik, Karel, Igor Koloniuk, Hana Sehadová, and Tatiana Sarkisova. "Chrysoviruses Inhabited Symbiotic Fungi of Lichens." Viruses 11, no. 12 (December 3, 2019): 1120. http://dx.doi.org/10.3390/v11121120.

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A lichen body is formed most often from green alga cells trapped in a net of ascomycetous fungi and accompanied by endolichenic or parasitic fungi, other algae, and symbiotic or free-living bacteria. The lichen’s microcosmos is inhabited by mites, insects, and other animals for which the lichen is a source of food or a place to live. Novel, four-segmented dsRNA viruses were detected in saxicolous Chrysothrix chlorina and Lepraria incana lichens. Comparison of encoded genome proteins revealed classification of the viruses to the genus Alphachrysovirus and a relationship to chrysoviruses from filamentous ascomycetous fungi. We propose the names Chrysothrix chrysovirus 1 (CcCV1) and Lepraria chrysovirus 1 (LiCV1) as acronyms for these viruses. Surprisingly, observation of Chrysothrix chlorina hybridization with fluorescent-labelled virus probe by confocal microscope revealed that the CcCV1 virus is not present in the lichen body-forming fungus but in accompanying endolichenic Penicillium citreosulfuratum fungus. These are the first descriptions of mycoviruses from a lichen environment.
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Dissertations / Theses on the topic "Lichens"

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Johansson, Per. "Effects of habitat conditions and disturbance on lichen diversity : studies on lichen communities in nemoral, boreal and grassland ecosystems /." Uppsala : Dept. of Conservation Biology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200606.pdf.

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Denoeud-Valdeyron, Marie-Laure. "Les lichens, bioindicateurs de pollution atmospherique : application aux alentours de l'usine roquette a lestrem." Lille 2, 1992. http://www.theses.fr/1992LIL2P020.

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MATHEY, ANNICK. "De in situ lichenum investigatione de l'analyse in situ des lichens." Paris 6, 1987. http://www.theses.fr/1987PA066744.

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Le but de l'etude est de montrer, a partir d'exemples qu'il est possible de reunir des informations sur une plante (morphologie, anatomie, chimie et ecologie) sans creation d'artefact et de remplacer des donnees subjectives par des donnees mesurables, c'est-a-dire reproductibles. Les lichens constituent un modele biologique
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Chu, Fung Joanna. "Ecology of supralittoral lichens on Hong Kong rocky shores /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18735526.

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Högnabba, Filip. "Phylogenetic studies of cyanobacterial lichens /." Helsinki : Yliopistopaino, 2007. http://ethesis.helsinki.fi.

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Carter, Nick. "Bioprotection explored : lichens on limestone." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396154.

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Hogan, Erika. "Nitrogen-phosphorus relationships in lichens." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10906/.

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Nitrogen enrichment promotes phosphomonoesterase (PME) activity in the common heathland lichen Cladonia portentosa. This is associated with a marked increase in thallus N:P mass ratio and significant up-regulation of inorganic phosphate uptake capacity, evidencing a shift from N-limited to P-limited growth. Phosphomonoesterase activity in C. portentosa responds rapidly to change in N deposition load, with a significant increase in activity recorded within 6 months of transplantation from a low-N to high-N site. The location of PME activity in C. portentosa was revealed using a fluorescent marker and was found to be concentrated on both the outer and inner surfaces of the hollow ‘tube-like’ thallus branches. Activity appeared to be associated exclusively with the mycobiont and was located within the hyphal-lumina, consistent with a membrane bound ecto-enzyme. High PME activity in axenic mycobiont cultures of C. portentosa provided further evidence of a fungal location and confirmed that rates of activity in this lichen are amongst the highest reported for any other plant/fungal system in the literature. Different classes of phosphatases were assayed in a range of N2-fixing and non-N2-fixing lichens in an oligotrophic subarctic environment. No relationship was found between the capacities for nitrogenase and PME activities. Maximum rates of PME activity were recorded in fruticose mat-forming lichens which capture nutrients predominantly from atmospheric deposits. 5´ nucleotide phosphodiesterase activity was readily detected in N2-fixing lichens and was particularly high in rhizine-rich regions of foliose terricolous lichen thalli, consistent with the utilisation of organic phosphates from soil and litter sources.
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McDaid, Ann. "Chemical characterisation of Irish lichens." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282253.

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Caldiz, Mayra S. "Diversity and growth of epiphytic macrolichens in northwestern Patagonian Nothofagus forests /." Alnarp : Swedish University of Agricultural Sciences, 2005. http://diss-epsilon.slu.se/archive/00000831/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2005.
Thesis documentation sheet inserted. Appendix reproduces four papers and manuscripts, three co-authored with others. Includes bibliographical references. Also partially available electronically via World Wide Web in PDF format; online version lacks appendix.
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Dahlman, Lena. "Resource aquisition and allocation in lichens." Doctoral thesis, Umeå : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-115.

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Books on the topic "Lichens"

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Purvis, William. Lichens. Washington, D.C: Smithsonian Institution Press in association with the Natural History Museum, London, 2000.

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Dobson, Frank S. Lichens. 4th ed. Slough: Richmond, 2000.

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(Agency), Scottish Natural Heritage, ed. Lichens. Perth: Scottish Natural Heritage, 2004.

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Nimis, Pier Luigi, Christoph Scheidegger, and Patricia A. Wolseley, eds. Monitoring with Lichens — Monitoring Lichens. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0423-7.

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L, Nimis P., Scheidegger Christoph, and Wolseley P. A, eds. Monitoring with lichens: Monitoring lichens. Dordrecht: Kluwer Academic, 2002.

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Woods, R. G. A conservation evaluation of British lichens. London: British Lichen Society, 2003.

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Medlin, Julie Jones. Michigan lichens. Bloomfield Hills, Mich: Cranbrook Institute of Science, 1996.

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Orange, Alan. Microchemical methods for the identification of Lichens. London: British Lichen Society, 2001.

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Juliette, Asta, and Gavériaux Jean-Pierre, eds. Guide des lichens de France: Lichens des arbres. [Paris]: Belin, 2009.

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Madgwick, Wendy. Fungi and lichens. Oxford: Heinemann Educational Books Ltd, 1990.

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Book chapters on the topic "Lichens"

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_878-2.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-642-27833-4_878-3.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1377–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_878.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 918–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_878.

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Horst, R. Kenneth. "Lichens." In Westcott's Plant Disease Handbook, 237. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-2141-8_34.

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Grube, Martin. "Lichens." In Fungal Associations, 145–79. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-41648-4_6.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-642-27833-4_878-4.

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Sancho, Leopoldo G. "Lichens." In Encyclopedia of Astrobiology, 1666–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_878.

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Pandian, T. J. "Lichens." In Evolution and Speciation in Fungi and Eukaryotic Biodiversity, 152–71. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003361350-11.

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Nimis, P. L., C. Scheidegger, and P. A. Wolseley. "Monitoring with Lichens — Monitoring Lichens." In Monitoring with Lichens — Monitoring Lichens, 1–4. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0423-7_1.

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Conference papers on the topic "Lichens"

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Pchelkina, T., Anna Koukhta, and Aleksey Pchelkin. "THE ROLE OF MICROCLIMATIC CONDITIONS IN FORMATION OF LICHENOBIOTA RESPONSE TO ANTHROPOGENIC POLLUTION IN MOSCOW." In Land Degradation and Desertification: Problems of Sustainable Land Management and Adaptation. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1704.978-5-317-06490-7/180-185.

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The paper considers the combination of climatic and anthropogenic factors on the lichen flora of the metropolis. The impact level of each factor chaing leads to changes in the status of biota. With the same background level of pollution, the value of the atmosphere purity index is higher under more favorable microclimatic conditions for lichens. Monitoring of influence of one of factors on lichenological indicators should be carried out at invariable value of other factor.
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Masu, Smaranda. "AIR BIOMONITORING USING LICHENS." In International Symposium "The Environment and the Industry". National Research and Development Institute for Industrial Ecology, 2016. http://dx.doi.org/10.21698/simi.2016.0016.

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Tomović, Jovica, Perica Vasiljević, Aleksandar Kočović, and Nedeljko Manojlović. "HPLC/UV profile and determination of total phenolic and flavonoid contents of lichen Umbilicaria crustulosa growing in Serbia." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.511t.

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The lichens synthesize a large number of secondary metabolites and most of these compounds are unique to lichen. The present study provides data concerning the chemical characterization and determination of total phenolic and flavonoid contents of lichen extracts of Umbilicaria crustulosa. Chemical profiling of the extracts was done by high-performance liquid chromatography coupled with a UV detector (HPLC/UV), while the determination of total phenolic and flavonoid contents was done by the spectrophotometric method. HPLC analysis of the acetone and methanol extracts of U. crustulosa lichen revealed the presence of the methyl-orselinate, lecanoric acid, crustinic acid, haematommic acid, gyrophoric acid, methyl lecanorate, physodic acid, atranorin and chloroatranorin as the main compounds. The most abundant compounds of the acetone and methanol extracts were the tri-depside gyrophoric acid (59.27 % and 58.32 %) and didepside lecanoric acid (7.41 % and 11.43 %). The results of the total phenolic content (TPC) and total flavonoid content (TFC) show that the acetone extract had higher values of TPC (205.46 mg GA/g) and TFC (290.18 mg RE/g; 160.50 mg QE/g). The investigated extracts of the lichen U. crustulosa can be used as a significant source of biologically active compounds.
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Cohen, Sophie, William Smisko, Matthew Harrison, Alex Blumenthal, and Jonathan P. Schmitkons. "DETERMINING THE EFFECT OF TREE CANOPY AND LICHEN SPECIES ON SORPTION CAPABILITIES OF LICHENS." In 54th Annual GSA Northeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019ne-328313.

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Skirin, F. V. "ВИДОВОЙ СОСТАВ ЛИШАЙНИКОВ И ЭКОЛОГО-СУБСТРАТНЫЕ ОСОБЕННОСТИ КОРЫ КАЛОПАНАКСА СЕМИЛОПАСТНОГО." In GEOGRAFICHESKIE I GEOEKOLOGICHESKIE ISSLEDOVANIIA NA DAL`NEM VOSTOKE. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.35735/tig.2019.57.80.011.

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Данная работа направлена на изучение видового состава эпифитных лишайников калопанакса семилопастного (диморфанта) и экологосубстратных особенностей его коры (ритидома). Работы проводились на юге Приморского края: на полуострове МуравьёваАмурского, в окрестностях посёлка Заводской (Артёмовский городской округ), на о. Русский и хребте Барачный (Надеждинский район). Заложено 9 пробных площадей. На калопанаксе были отобраны образцы эпифитных лишайников и коры (ритидома) для определения реакции рН. При выявлении видового состава эпифитных лишайников были использованы как собственные данные автора, так и литературные данные. Видовой состав эпифитных лишайников для калопанакса семилопастного включает 46 видов, 24 из которых, приводятся по литературным данным. Отмечено преобладание в видовом составе диморфанта накипных лишайников, что не характерно для форофитов с подобным типом коры. Исследованы экологосубстратные особенности коры диморфанта для деревьев различного возраста. Структура коры взрослого калопанакса сходна с таковой у дуба монгольского. Также, впервые был определен диапазон рН коры диморфанта. Отмечено сходство значений кислотности коры исследуемого форофита с таковыми для дуба монгольского, липы амурской и многих других деревьев. Отмечается, что видовое богатство и проективное покрытие лишайников на стволах калопанакса заметно ниже, чем у форофитов, имеющих сходные с ним характеристики коры и произрастающих в той же лесной формации. Отчасти это явление обуславливается особенностями коры молодых калопанаксов, отчасти общим снижением видового разнообразия эпифитных лишайников под антропогенным влиянием. Тем не менее, не удаётся выявить факторы, затрудняющие заселение стволов взрослых калопанаксов эпифитами, в условиях экосистем с высоким видовым разнообразием лишайников. Возможно, причина заключается в химическом составе ритидома дерева. В литературе упоминалось о подавлении роста бактерий золотистого стафилококка настоем коры калопанакса, однако сведений о влиянии химических компонентов его коры на лишайники или их отдельные компоненты не выявлено.This paper represents a study of a species composition of lichens that grows on Kalopanax septemlobus and ecosubstrate features of its bark. The area of study covers the south of Primorsky Krai at MuravyovAmursky peninsula near the Zavodskoy town (Artyomovskiy city district), at Russky island and at the Barachniy ridge (Nadezhdinsky district). 9 sample plots were placed. Epiphytic lichens and three bark samples for the pH determination was taken from kalopanax. For the identification of epiphytic lichens species composition both authors own data and literature data were used. Epiphytic lichens composition for the Kalopanax septemlobus includes 46 species, 24 of which are given according to literature data. Predominance of crustose thallus lichens over foliose thallus lichens was observed. This fact shows nontypical situation for the phorophytes with this type of bark. Ecosubstrate features of kalopanax bark were studied for threes of different ages. Bark structure of the mature kalopanax is similar to bark of Quercus mongolica. Also, there was the first time when pH range of kalopanax bark was identified. A similarity was noted between the acidity of the bark of the studied forophyte and those for Mongolian oak, Amur linden and many other trees. We have noted that biodiversity and projective cover of epiphytic lichens on kalopanax trunk is noticeably lower than for ones on the other threes that have similar bark properties and those are growing at the same forest ecosystem. Partly this phenomenon is caused by the peculiarities of the bark of young kalopanaks, partly by a general decrease in the species diversity of epiphytic lichens under anthropogenic influence. Nevertheless, it is not possible to identify factors that impede the colonization of adult kalopanax trunks with epiphytes in ecosystems with a high species diversity of lichens. Perhaps the reason is the chemical composition of tree ritidom. In the literature, it was mentioned that staphylococcus aureus bacteria growth was suppressed by infusion of kalopanax bark, however, no information was found on the effect of the chemical components of its bark on lichens or their separate components.
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Beckett, R. P. "Safely valves for photosynthesis in lichens." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-25.

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Ignatiev, Yu V., S. S. Gorina, A. G. Daminova, and F. V. Minibaeva. "Molecular-genetic identification of symbiotic bacteria lichens." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-191.

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Happitiya, H. A. D. N. N., C. M. Nanayakkara, K. G. S. U. Ariyawansa, S. S. Ediriweera, N. N. Wijayawardene, R. P. P. K. Jayasinghe, Don Qin Dai, and S. C. Karunarathna. "Antibacterial Activities of Lichen-associated Fungi in Mangrove Ecosystems in Sri Lanka as Potent Candidates for Novel Antibiotic Agents." In SLIIT International Conference on Advancements in Sciences and Humanities 2023. Faculty of Humanities and Sciences, SLIIT, 2023. http://dx.doi.org/10.54389/slzp7371.

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Antimicrobial resistance is a global threat to humans, prompting an increasing interest in exploring and developing novel antimicrobial substances derived from diverse sources. Together with the emergence of new diseases the search for novel drug leads has intensified. Less explored microbial habitats have become prime targets in mining for novel antimicrobial molecules. Secondary metabolites synthesized by lichen-associated fungi are good potential targets in this regard. Hence, this study was carried out to explore the antibacterial potential of lichen associated fungi in mangrove ecosystems by taking National Aquatic Resources Research and Development Agency (NARA) Regional Research Centre, Kalpitiya, Puttalam District, Sri Lanka as the study site. Lichen-associated fungi were isolated from collected lichens by plating out surface sterilized lichen thalli pieces. Antibacterial activities of the isolates were tested using two gram-positive bacteria: Staphylococcus aureus and Bacillus cereus and two gram-negative bacteria: Pseudomonas aeruginosa and Escherichia coli. In this study, 72 putative fungal isolates were primarily screened for their antibacterial activity using agar plug diffusion assay and ethyl acetate crude fungal extracts of nine fungal isolates with marked activity were secondarily screened using the well diffusion assay in triplicate. Isolate LIF 0803 identified as Trichosporon faecale showed the most outstanding antibacterial activities as 2.58 ± 0.29, 3.43 ± 0.05, 4.2 ± 0, 4.5 ± 0.14 cm of zone diameter at 100 mg/mL and 1.95 ± 0.59, 3.08 ± 0.13, 3.7 ± 0.12, 4.3 ± 0.19 cm of zone diameter at 50 mg/mL against P. aeruginosa, S. aureus, B. cereus, and E. coli. All nine fungal isolates showed promising antimicrobial activity against both gram positive and negative bacteria. Therefore, this study showed that lichen-associated fungi in mangrove ecosystems have potent antibacterial activities. Hence, bioassay guided fractionation of active compounds from lichen-associated fungi and structure elucidation are warranted.
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Popovici, Violeta, Laura Bucur, Verginica Schroder, Aureliana Caraiane, and Victoria Badea. "STUDIES ON THE CYTOTOXIC POTENTIAL OF THE EXTRACT OF USNEA BARBATA (L.) F.H.WIGG." In NORDSCI International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/nordsci2020/b1/v3/29.

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Usnea barbata (L.) F.H.Wigg. is a fruticose lichen widespread in coniferous forests in the temperate zone of Europe and North America. The special dual structure of lichens, the result of the symbiosis between a fungus and an alga / cyanobacteria and the specific conditions in which they live, determine the synthesis of many special organic compounds - secondary metabolites - which ensure optimal protection against disturbing physical and biological factors. The present study aims to evaluate the cytotoxic activity of the extract of Usnea barbata (L.) F H Wigg. The cytotoxic activity was evaluated on the swimming larvae of Artemia salina L. The results was appreciated by the larvae mortality in contact with solutions of different concentrations of extract in dimethyl sulfoxide, comprised in the range 30 - 266 μg/mL; the highest mortality rate was obtained at 266 μg/mL. In conclusion, the present study shows that the extract of Usnea barbata (L.) F.H.Wigg. has cytotoxic properties; the cytotoxicity is directly proportional to the concentration of the applied extract solution.
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Kalashnikova, Daria, Galina Simonova, and Viktor Melkov. "Air quality biomonitoring with epiphytic lichens and mosses." In XXIV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, edited by Oleg A. Romanovskii and Gennadii G. Matvienko. SPIE, 2018. http://dx.doi.org/10.1117/12.2504559.

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Reports on the topic "Lichens"

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Daniele Armaleo, Daniele Armaleo. How do lichens withstand desiccation? Experiment, December 2018. http://dx.doi.org/10.18258/12505.

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Hochman, Ayala, Thomas Nash III, and Pamela Padgett. Physiological and Biochemical Characterization of the Effects of Oxidant Air Pollutants, Ozone and Gas-phase Nitric Acid, on Plants and Lichens for their Use as Early Warning Biomonitors of these Air Pollutants. United States Department of Agriculture, January 2011. http://dx.doi.org/10.32747/2011.7697115.bard.

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Introduction. Ozone and related oxidants are regarded as the most important phytotoxic air pollutant in many parts of the western world. A previously unrecognized component of smog, nitric acid, may have even greater deleterious effects on plants either by itself or by augmenting ozone injury. The effects of ozone on plants are well characterized with respect to structural and physiological changes, but very little is known about the biochemical changes in plants and lichens exposed to ozone and/or HNO3. Objectives.To compare and contrast the responses of crop plants and lichens to dry deposition of HNO3 and O3., separately, and combined in order to assess our working hypothesis that lichens respond to air pollution faster than plants. Lichens are most suitable for use as biomonitors because they offer a live-organism-based system that does not require maintenance and can be attached to any site, without the need for man-made technical support systems. Original Immediate aims To expose the tobacco (Nicotiana tabacum L.) cultivar Bel-W3 that is ozone supersensitive and the ozone sensitive red kidney bean (Phaseolusvulgaris) and the lichen Ramalinamenziesii to controlled HNO3 and O3 fumigations and combined and to follow the resulting structural, physiological and biochemical changes, with special reference to reactive oxygen species related parameters. Revised. Due to technical problems and time limitations we studied the lichen Ramalinamenziesii and two cultivar of tobacco: Bel-W3 that is ozone supersensitive and a resistant cultivar, which were exposed to HNO3 and O3 alone (not combined). Methodology. Plants and lichens were exposed in fumigation experiments to HNO3 and O3, in constantly stirred tank reactors and the resulting structural, physiological and biochemical changes were analyzed. Results. Lichens. Exposure of Ramalinamenziesiito HNO3 resulted in cell membrane damage that was evident by 14 days and continues to worsen by 28 days. Chlorophyll, photosynthesis and respiration all declined significantly in HNO3 treatments, with the toxic effects increasing with dosage. In contrast, O3 fumigations of R. menziesii showed no significant negative effects with no differences in the above response variables between high, moderate and low levels of fumigations. There was a gradual decrease in catalase activity with increased levels of HNO3. The activity of glutathione reductase dropped to 20% in thalli exposed to low HNO3 but increased with its increase. Glucose 6-phosphate dehydrogenase activity increase by 20% with low levels of the pollutants but decreased with its increase. Tobacco. After 3 weeks of exposure of the sensitive tobacco cultivar to ozone there were visible symptoms of toxicity, but no danmage was evident in the tolerant cultivar. Neither cultivar showed any visible symptoms after exposure to HNO3.In tobacco fumigated with O3, there was a significant decrease in maximum photosynthetic CO2 assimilation and stomatal conductance at high levels of the pollutant, while changes in mesophyll conductance were not significant. However, under HNO3 fumigation there was a significant increase in mesophyll conductance at low and high HNO3 levels while changes in maximum photosynthetic CO2 assimilation and stomatal conductance were not significant. We could not detect any activity of the antioxidant enzymes in the fumigated tobacco leaves. This is in spite of the fact that we were able to assay the enzymes in tobacco leaves grown in Israel. Conclusions. This project generated novel data, and potentially applicable to agriculture, on the differential response of lichens and tobacco to HNO3 and O3 pollutants. However, due to experimental problems and time limitation discussed in the body of the report, our data do not justify yet application for a full, 4-year grant. We hope that in the future we shall conduct more experiments related to our objectives, which will serve as a basis for a larger scale project to explore the possibility of using lichens and/or plants for biomonitoring of ozone and nitric acid air pollution.
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Stolte, K., D. Mangis, R. Doty, K. Tonnessen, and Laurie S. Huckaby. Lichens as bioindicators of air quality. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1993. http://dx.doi.org/10.2737/rm-gtr-224.

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Stolte, K., D. Mangis, R. Doty, K. Tonnessen, and Laurie S. Huckaby. Lichens as bioindicators of air quality. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1993. http://dx.doi.org/10.2737/rm-gtr-224.

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Mercado-Díaz, Joel A., William A. Gould, Grizelle Gonzalez, and Robert Lücking. Lichens in Puerto Rico: an ecosystem approach. San Juan, PR: U.S. Department of Agriculture, Forest Service, International Institute of Tropical Forestry, 2015. http://dx.doi.org/10.2737/iitf-gtr-46.

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Smith, M., C. J. Rickwood, G. Prabhakar, P. Opra, and L. M. Campbell. Lichens as dust and air quality biomarkers. Natural Resources Canada/CMSS/Information Management, 2020. http://dx.doi.org/10.4095/g274821.

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Joseph, Rhawn. Mars: Algae, Lichens, Fossils, Minerals, Microbial Mats, and Stromatolites in Gale Crater. Journal of Astrobiology and Space Science, March 2020. http://dx.doi.org/10.37720/jassr.03082020.

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Dibble, Alison C., James W. Hinds, Ralph Perron, Natalie Cleavitt, Richard L. Poirot, and Linda H. Pardo. Monitoring air quality in class I wilderness areas of the northeastern United States using lichens and bryophytes. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station, 2016. http://dx.doi.org/10.2737/nrs-gtr-165.

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Dibble, Alison C., James W. Hinds, Ralph Perron, Natalie Cleavitt, Richard L. Poirot, and Linda H. Pardo. Monitoring air quality in class I wilderness areas of the northeastern United States using lichens and bryophytes. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station, 2016. http://dx.doi.org/10.2737/nrs-gtr-165.

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Battista Di Pierro, Giovanni, and Enzo Palminteri. Management of penile lichen sclerosus. BJUI Knowledge, October 2019. http://dx.doi.org/10.18591/bjuik.0709.

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